Impulse sender



Jan. 11, 1938. ET AL 2,104,998

IMPULSE SENDER Filed Oct. 25, 1935 EMER GE/VCY 5734710 PRESELECTDR TELEPHONE FIG. 2

INVENTOR.

, FRIEDRICH LILL BENEDIKT KUDRNA ATTORNEY.

Patented Jan. 11, 1938 PATENT orFicE IMPULSE SENDER Friedrich Lill and Benedikt Kudrna, Vienna,

Austria, assigncrs to tiengesellschaft, near Berlin, Germany Application October 25,

Siemens & Halske Ak- Wernerwerk, Siemensstadt,

1935, Serial No. 46,672

In Austria October 31, 1934 Claims.

The invention relates to an impulse sender for setting up telephone calls automatically by means of a single operation of the setting device. In an impulse sender of this type it is usual to pro- 5 vide a disc, or the like, which can be displaced along an axle and which serves as a setting memher and according to the position in which it is set effects the necessary impulse control. The number of impulses to be transmitted is con- 0 trolled by camsor the like, on the axle whose relative position in each cam sequence varies according to the number of the subscriber to be called.

When the disc has been set on one of the cam sequences the latter is set in rotation together with the other cam sequences by means of a spring drive or the like and in conjunction with the setting member effects the control of the impulse contact. Patent 1,965,122 issued July 3,

1934 to L. Kardorif shows an example of one form of this structure.

The invention proposes to use such an impulse sender both for calling the various subscribers of the system in which case the setting member is pushed to the appropriate position and the apparatus is then operated and released by hand, and also for transmitting impulse trains for' the purpose of calling particular stations e. g. police station, fire station, etc., in which case the transmission of these impulses is effected independ- 39 ently of the actual position of the setting member without the apparatus being operated by hand since in this case its release is remotely controlled by means of keys or emergencycontacts e. g.

burglar alarm contacts. This is of great advantage since the transmission of the communicating impulse trains can be governed from any desired spot, independently of the position of the impulse sender.

The known impulse senders whose manner of operation is described in the aforesaid patent have the property that the driving springs, after each operation and subsequent release, possess a residual tension which is capable of producing several complete rotations of the impulse sender. This residual tension in the driving spring is now used to effect the sending of impulses for the special purposes such as calling up the police or fire station, etc. for which a special constant succession of impulses must be transmitted.

A further characteristic of the invention resides in that the release of the impulse sender for the purpose of giving out the aforementioned definite succession of impulses is remotely controlled by means of an electromagnetic switching means (relay) in that the locking pawl which prevents the impulse sender from executing more than one rotation is removed from engagement so that the impulse sender is free to rotate. This switching means when operated switches over from the impulse contact which can be set by means of a slider, to rigidly mounted contacts over which the necessary succession of impulses for calling up the police, fire station, etc., are transmitted.

The drawing, Figs. 1 and 2, represents an embodiment of the invention. The invention is, however, not limited to this embodiment. The device shown is one in which only one particular station is called by means of the electrical remote control, this being the police. It is clearly possible to call a number of such stations e. g. fire station, police station, in a simple manner, in which case, through operating diiferent keys, various fixed contacts are operated by means of various electromagnetic switching means. Fig. 1 shows the general mechanical construction of the impulse sender. The impulse sender consists of a displaceable contact lk (Fig. 2) on a setting member such as 3 of the patent which, with the cooperation of contact 32 (Fig. 2) transmits particular impulse trains to the exchange, according to the setting taken up during the motion of the impulse sender over cam discs such as I! of the patent which are fastened to a shaft I, with the object of effecting a simpler and more rapid establishment of calls to stations which are often in demand. The driving shaft l is associated with a driving spring which is not shown which permanently strives to rotate the shaft 5 carrying the impulse cam discs, in the opposite direction to that in which it is drivenby a toothed gearing (not shown). This rotation is prevented by means of a disc 2, mounted on the shaft I, which possesses a slot 3 in which the nose 5 of a pawl 4 engages. The pawl 4 which is pivoted at its axis of rotation 6 is pressed into the locking slot 3 by a spring ID. The corresponding elements of the aforesaid patent are disc l3, shaft '1, slot 43, and pawl l2.

The mechanical release of the impulse sender takes place, after the setting member corresponding to member 3 of the patent has been displaced, by means of a lever such as 2 which rotates a driving shaft 1 in the direction opposite to that shown, whereby the locking pawl 5 is raised by means of the screw 3 on the shaft i thus releasing the disc 2. In the patent this is accomplished by lever 2 engaging shaft II to disengage pawl 2 from disc 1 3. The driving sprmg is wound up at the same time. During the motion or the impulse sender the driving shaft 1 subjected to current the projection 9 associated-. with the armature moves downward whereupon the locking lever 4 disengages from notch 3 and releases the impulse sender.

Fig. 2 indicates the electrical arrangements.

The impulse sender possesses yet another contact 1km: Withdrawn from the subscribers influence, which in association with. contact 82' transmits the impulse trains necessary for se'-' The transmission lecting the particular station. of the impulse trains characterizing the calling subscriber is necessary so that the calling subscriber need not take up the receiver and yet the called station will be informed as to which subscriber is in danger. During the motion of the impulse sender contact lZko of the latter is permanently closedand characterizes the normal position. of the impulse sender. The two relays A and B bring about the operation of the appropriate contacts. All further details, such as the selecting switches or devices in the exchange, are shown diagrammatically while thegdetails which are not essential for'understanding the invention are omitted.

If the subscriberwishes to establish a connection with a subscriber which is provided for by the impulse sender, he takes up the receiver thereby closing the usual subscribers loop circuit to the preselector which operates in thewell known manner to seize an idle selector. He then sets the displaceablecontact lk over the appropriate cam disc, and then operates the driving device of the impulse sender whereby the necessary loop interruptionsfor establishingthe desired connectionby operation of the selector and connector in the exchange are transmitted over line a. contacts 217-, Ht, 6b, 82, and line h, during the motion of the impulse sender thus produced. The contacts 11cm: and mm which areoperated mechanically remain electrically inoperative during this process. 7

If, however, the subscriber, who is in difiiculties, wishes, for example, to call the police, he has merely transitorily to operate the key T which is placed many desired locationand is connect ed to the impulse sender by a line. A circuit is thereby completed for relay A: earth T, lib, relay A, b-lead, and byway ofia relay in the exchange which preselector is shown. diagrammatically, to. battery. This results in the operation of .thepreselector to select an idle selector switch. Relay B which is connected up in parallel to the b-lead over: earth, operated contact 30., winding I of relay B, contact 17cm, operated contact 5a,. is so adjusted, that it cannot energize over the line resistance in parallel with the low resistance relay A, so long as the key remains depressed. As soon. as the key is released relay B energizes on account of the disconnection of the parallel low resistance circuit of relay A;

Relay A is slow to release on account of the possession of a copper slug. Relay B energizes and by the movement of its armature effects the mechanical release of the impulse sender in the manner already described. After the deenergizing of relay A relay B remains connected to the b-lead over a second winding BII, contact 9b, and contact l2ko of the impulse sender which remains closed throughout the motion of the sender. Contact 1km transmits the impulses necessary for characterizing the calling'station and for callingthe police station over the a-lead, operated'contacts 2b and 3a; contact Ham, and contact Bi or contacts wand 81. The selector and connector are thereby operated to establish 1 the emergency connection. Contact Ik which is operated mechanically remains inoperative during this transmission. After the impulse sender has come to're'st contactl2ko opens and relay B deenergizes- If the key Tis depressed a second time after the energizing' of relay B, contact Ilb prevents the impulsetransmission which has already com- ,menced, from being interrupted.

If the key? is depressed. while the subscribers station is connected for a normal call,.the latter is interrupted by the low resistance earthing of the b-lead iover relay A, and the same operations are brought into play' as have already been described. a Y

If the key T is depressed while the impulse sender is in operation .for setting up a normal call, the partial connection already 'efiected is brokendown by the earthing through low re sistance. Over earthycontacts l27co, Ida, lib, relay A, b-lead, and battery in the exchange, re.- lay A remains energized and the earth connected to the exchange is maintained until the impulse sender reaches its. normal position when contact 121cc opens and the operationsalready' described take place.

Whatis claimed is: v q 1. In an impulse sender for establishing telephone calls in which a setting member is employed for selecting any desired station to be called, means for operating said impulse sender after said setting member has been operated to establish a callto another station, and means for operating said impulse sender to establish a call to a different station independent of the operated position of said setting member.

2. In an impulse sender for establishing telephone calls in which a manually operated setting member is used for selecting any desired called station, manually operated. means for operating said impulse. sender afterisaid setting member has been set to'a desired station for establishing a; call to that station and remotely controlled means for operating said impulse sender to establish an emergency call independent of the operatedposition of said Setting member.

3. In an impulse sender for establishing telephone callsin which a setting member is manually operated to a position corresponding to a desired called station, manually'operated means for starting the operation of said impulse sender to establish a connection with the station on which saidsetting member has been set, remotely controlled means for starting ,the'operatio'n ofv said impulse sender to establish a'connection with 'anemergency station independent of the' oper-" ated position of said setting member, and'circuit means for disconnecting an existing connection called station at atime when the remotely controlled means operates the impulse sender.

4. Inan impulse sender as claimed in claim 3, means'forregistering the remote control operation of the impulse sender in case the impulse sender is being operated for another call until it has reachedits normal position.

with'a called station or one being set up to a 5. In an impulse sender for establishing calls between stations having a setting member which is moved to a position corresponding to a desired station and in which a driving spring in said sender supplies the motive power, manually operated means for tensioning said spring and starting the operation of said impulse sender to establish a call to the station selected by said setting member, remotely controlled means for starting the operation of said impulse sender to establish a call to an emergency station independent of the setting of said setting member, the residual tension stored in said driving spring after each manual operation of said impulse sender being eflective to operate said sender when remotely controlled.

6. In an impulse sender as claimed in claim 2 in which impulse contacts for calling other stations and emergency contacts are provided and in which said remotely controlled means includes an electromagnet that efiects the disconnection of the impulse sending contacts for calling other stations and connects up other impulse sending contacts for establishing other emergency calls.

7. In an impulse sender as claimed in claim 3 in which after the impulse sender has been operated in response to the remote control and disconnected an existing connection the connection of the calling telephone is reestablished.

8. In a telephone system, an impulse sender for transmitting regular call numbers to connect with called telephone lines and also for transmitting emergency call numbers in which the sender is manually set to transmit regular call numbers to connect with a called line, and separate means for controlling said sender to automatically transmit an emergency call independent of the setting 01' the sender and independent of a previously established connection to a regular line.

9. In a telephone system, an impulse sender having a set of impulse contacts for establishing connections with regular called telephone lines and another set of impulse contacts for establishing a connection with an emergency line, means in said sender for connecting said regular impulse contacts for operation and for then operating them to establish a connection with a called telephone line, a relay in said sender having a set of contacts for connecting said other set of impulse contacts for operation, and remotely controlled means for operating said relay.

10. In a telephone system, an impulse sender having a set of regular impulse contacts for establishing connections with called telephone lines and another set of impulse springs for establishing a connection with a single special line, circuit connections extending from each of said set of impulse contacts to the telephone line, switching springs manually operated to connect said regular impulse contacts to the line to establish a connection with a called line, a relay in said sender, contacts operated by said relay to connect said other set of impulse contacts to the line to establish a connection with said single special line, said relay contacts also operated to disconnect said switching springs from the line to interrupt any established telephone connection, an emergency key located remote from said sender, and means responsive to the operation of said key for operating said relay.

FRIEDRICH LILL. BENEDIKT KUDRNA. 

